Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF6

Abstract

Thermodynamic properties and elementary excitations in $S=1/2$ one-dimensional Heisenberg antiferromagnet KCuGaF${}_6$ were investigated by magnetic susceptibility, specific heat and ESR measurements. Due to the Dzyaloshinsky-Moriya interaction with alternating $D$-vectors and/or the staggered $g$-tensor, the staggered magnetic field is induced when subjected to external magnetic field. Specific heat in magnetic field clearly shows the formation of excitation gap, which is attributed to the staggered magnetic field. The specific heat data was analyzed on the basis of the quantum sine-Gordon (SG) model. We observed many ESR modes including one soliton and three breather excitations characteristic of the quantum SG model.

4 pages, 5 figures, to appear in J. Phys. Soc. Jpn., vol. 76, no. 6

References in corpus (12)

• Thermodynamics of Spin S = 1/2 Antiferromagnetic Uniform and Alternating-Exchange Heisenberg Chains
• Susceptibility of the Spin 1/2 Heisenberg Antiferromagnetic Chain
• Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm
• Theory of the field-induced gap in $S=1/2$ antiferromagnetic chains
• On the Field-Induced Gap in Cu Benzoate and Other S=1/2 Antiferromagnets
• Direct Observation of Field-Induced Incommensurate Fluctuations in a One-Dimensional S=1/2 Antiferromagnet
• Neel Temperature of Quasi-Low-Dimensional Heisenberg Antiferromagnets
• The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents
• ESR investigation on the Breather mode and the Spinon-Breather dynamical crossover in Cu Benzoate
• Excitation hierarchy of the quantum sine-Gordon spin chain in strong magnetic field
• Sine-Gordon low-energy effective theory for Copper Benzoate
• Dynamical Structure Factor in Cu Benzoate and other spin-1/2 antiferromagnetic chains

Cited by in corpus (13)

• Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb${}_2$Cu${}_3$SnF${}_{12}$
• Magnetic susceptibilities in a family of S=1/2 Kagome antiferromagnet
• Modulation of breathers in cigar-shaped Bose-Einstein condensates
• High-harmonic generation by electric polarization, spin current, and magnetization
• Elementary excitations of S=1/2 one-dimensional antiferromagnet KCuGaF6 in magnetic field and quantum sine-Gordon model
• Rectification of Spin Current in Inversion-Asymmetric Magnets with Linearly-Polarized Electromagnetic Waves
• Orbital Arrangements and Magnetic Interactions in the Quasi-One-Dimensional Cuprates ACuMoO_4(OH) (A = Na, K)
• Modulation of breathers in the three-dimensional nonlinear Gross-Pitaevskii equation
• Thermodynamic properties of quantum sine-Gordon spin chain system KCuGaF6
• Breathers and Raman scattering in a two-leg ladder with staggered Dzialoshinskii-Moriya interaction
• Anisotropic Field-Induced Gap in Quasi-One-Dimensional Antiferromagnet KCuMoO${}_4$(OH)
• Elementary excitations and specific heat in quantum sine-Gordon spin chain KCuGaF6
• New S=1/2 Kagome Antiferromagnets A${}_2$Cu${}_3$SnF${}_{12}$: A=Cs and Rb